use super::{write_marker, RmpWrite};

use crate::encode::ValueWriteError;

use crate::Marker;

/// Encodes and attempts to write the most efficient string length implementation to the given

/// write, returning the marker used.

///

/// # Errors

///

/// This function will return `ValueWriteError` on any I/O error occurred while writing either the

/// marker or the data.

pub fn write_str_len<W: RmpWrite>(wr: &mut W, len: u32) -> Result<Marker, ValueWriteError<W::Error>> {

    let marker = if len < 32 {

        Marker::FixStr(len as u8)

    } else if len < 256 {

        Marker::Str8

    } else if u16::try_from(len).is_ok() {

        Marker::Str16

    } else {

        Marker::Str32

    };

    write_marker(wr, marker)?;

    if marker == Marker::Str8 {

        wr.write_data_u8(len as u8)?;

    }

    if marker == Marker::Str16 {

        wr.write_data_u16(len as u16)?;

    }

    if marker == Marker::Str32 {

        wr.write_data_u32(len)?;

    }

    Ok(marker)

}

/// Encodes and attempts to write the most efficient string binary representation to the

/// given `Write`.

///

/// # Errors

///

/// This function will return `ValueWriteError` on any I/O error occurred while writing either the

/// marker or the data.

// TODO: Docs, range check, example, visibility.

pub fn write_str<W: RmpWrite>(wr: &mut W, data: &str) -> Result<(), ValueWriteError<W::Error>> {

    write_str_len(wr, data.len() as u32)?;

    wr.write_bytes(data.as_bytes()).map_err(ValueWriteError::InvalidDataWrite)

}